I've been shooting 7207 (250D) and 7219 (500T) on 16mm for the past month on a feature, and have been astonished by the latitude of 500T -- for night shooting the light meter reads fstop 0, but then in telecine, the image is there and as good as my eye saw at the time.
We're using an Aaton LTR, and a Bolex Rex4 for pickups/sneaky shots, and we'll definitely have a few 100' Bolex spools left after shooting is through.... I'm glad this thread came up, because I was thinking about this the other night in terms of stills --
Has anyone ever tried using a Bolex as a still camera? Granting the initial investment is large (37.50 per 100' + processing at .13 per foot + telecine ~100.00) and there's a leap of faith putting all that material on one roll -- but -- it's around 4000 still frames per roll. And the look is certainly distinctive.
I've pulled frame grabs from telecine on other projects, (TriX on Super8 film, for example) and they generally look fantastic. Drawbacks beyond the investment also include the ungainliness of a cine camera-as-still camera, and, in the case of the Bolex, the horrible dim viewfinder. There is a parallax option, but I haven't tried it.